cells, communication and molecular biology review
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Cells, Communication and Molecular Biology Review. 1) Sign in 2) Make a Venn Diagram comparing prokaryote, plant and animal cells. Types of cells. Prokaryote bacteria cells. - no organelles. - organelles. Eukaryote animal cells. Eukaryote plant cells. - PowerPoint PPT PresentationTRANSCRIPT
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Cells, Communication and Molecular Biology
Review1) Sign in
2) Make a Venn Diagram comparing prokaryote, plant
and animal cells
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Prokaryotebacteria cellsTypes of cells
Eukaryoteanimal cells
- no organelles
- organelles
Eukaryoteplant cells
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Bacterial Cell=Prokaryote-have ribosomes, DNA loop +
plasmid, cell wall, cell membrane, flagella or cilia
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Gene cloning with a plasmid
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Bacteria group genes together • Operon
• genes grouped together with related functions • example: all enzymes in a metabolic pathway
• promoter = RNA polymerase binding site• single promoter controls transcription of all genes in operon• transcribed as one unit & a single mRNA is made
• operator = DNA binding site of repressor protein
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operator
promoter
Operon model
DNATATA
When gene is turned ON:Polymerase binds promoterGene is transcribed
gene1 gene2 gene3 gene4RNApolymerase
1 2 3 4mRNA
enzyme1 enzyme2 enzyme3 enzyme4
Slide by Kim Foglia modified
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operator
promoter
Operon model
DNATATA
RNApolymerase
repressor
repressor = repressor protein
GENE is TURNED OFF: Repressor binds to operator siteBlocks RNA Polymerase
gene1 gene2 gene3 gene4
1 2 3 4mRNA
enzyme1 enzyme2 enzyme3 enzyme4
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•REPRESSIBLE OPERONS are ONCan be turned off
EX: trp operon--makes enzymes used in tryptophan synthesis
•INDUCIBLE OPERONS are OFFCan be turned on
EX: lac operon--makes enzymes used in lactose digestion
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Eukaryotic Gene Regulation
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Question 1: Which of the following is true regarding spherical cells?A. As the diameter decreases, the surface area remains the same.B. As the diameter decreases, the surface area increases.C. As the diameter decreases, the surface-to-volume ratio increases.D. As the diameter increases, the volume decreases.E. The surface-to-volume ratio is independent of diameter.
Red book #53
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Question 1: Which of the following is true regarding spherical cells?A. As the diameter decreases, the surface area remains the same.B. As the diameter decreases, the surface area increases.C. As the diameter decreases, the surface-to-volume ratio increases.D. As the diameter increases, the volume decreases.E. The surface-to-volume ratio is independent of diameter.
Red book #53
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Limits to Cell Size
• Diffusion limits cell size• Movement from higher concentration to lower
concentration• Larger the distance, slower the diffusion rate• A cell 20 cm would require months for nutrients to get
to the center
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Cells gotta work to live! • What jobs do cells have to do?
• make proteins• proteins control every
cell function• make energy
• for daily life• for growth
• make more cells• growth• repair• renewal
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Question 2: Which of the following components of the cell membrane is responsible for active transport?
(A) Phospholipid(B) Protein(C) Lipid(D) Phosphate(E) Cholesterol
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Question 2: Which of the following components of the cell membrane is responsible for active transport?
(A) Phospholipid(B) Protein(C) Lipid(D) Phosphate(E) Cholesterol
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Questions 3-5
3. Site of glucose synthesis4. Site of conversion of chemical energy of glucose to ATP5. Site of modification and packaging of proteins and lipids prior to
export from the cell
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Questions 3-5
3. Site of glucose synthesis--A4. Site of conversion of chemical energy of glucose to ATP---D5. Site of modification and packaging of proteins and lipids prior to
export from the cell--E
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Cell CommunicationCommunication between cells requires:
ligand: the signaling molecule
receptor protein: the molecule to which the receptor binds-may be on the plasma membrane or within the cell
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Cell CommunicationThere are four basic mechanisms for cellular communication:
1. direct contact2. paracrine signaling3. endocrine signaling4. synaptic signaling
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Cell CommunicationDirect contact – molecules on the surface of one cell are recognized by
receptors on the adjacent cell
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Cell CommunicationParacrine signaling – signal released from a cell has an effect on
neighboring cells
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Cell CommunicationEndocrine signaling – hormones released from a cell affect other cells
throughout the body
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Cell CommunicationSynaptic signaling – nerve cells release the signal (neurotransmitter)
which binds to receptors on nearby cells
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2007-2008
DNA Replication=S phase of the cell cycle
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The Cell Cycle Clock: Cyclins and Cyclin-Dependent Kinase•Fluctuations in the abundance and activity of cell cycle control molecules pace the sequential events of the cell cycle. •Protein kinases, give the go-ahead signals at the G1 and G2 checkpoints •The kinases are present at a constant concentration in the growing cell, but much of the time they are in inactive form. •To be active, such a kinase must be attached to a cyclin, a protein that gets its name from its cyclically fluctuating concentration in the cell. •These kinases are called cyclin-dependent kinases, or Cdks. The activity of a Cdk rises and falls with changes in the concentration of its cyclin partner.
Cdks are relatively constant
Cyclins vary in the cycle
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Copying DNA• Replication of DNA
• base pairing allows each strand to serve as a template for a new strand
• new strand is 1/2 parent template & 1/2 new DNA
• semi-conservative copy process
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DNA Replication • Large team of enzymes coordinates replication
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Replication: 1st step• Unwind DNA
• helicase enzyme• unwinds part of DNA helix• stabilized by single-stranded binding proteins
single-stranded binding proteins replication fork
helicase
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DNAPolymerase III
Replication: 2nd step Build daughter DNA strand
add new complementary bases
DNA polymerase III
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Replication fork
3’
5’3’
5’
5’
3’3’ 5’
helicase
direction of replication
SSB = single-stranded binding proteins
primase
DNA polymerase III
DNA polymerase III
DNA polymerase I
ligase
Okazaki fragments
leading strand
lagging strand
SSB
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A DNA ligaseB DNA polymeraseC RNA polymeraseD Restriction enzymeE Reverse Transcriptase
6. Enzyme used in the synthesis of mRNA
7. Enzyme used during replication to attach Okazki fragments to each other
8. Enzyme found in retrovirus that produces DNA from an RNA template
9. Enzyme used to position nucleotides during DNA replication
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A DNA ligaseB DNA polymeraseC RNA polymeraseD Restriction enzymeE Reverse Transcriptase
6. Enzyme used in the synthesis of mRNA C
7. Enzyme used during replication to attach Okazki fragments to each other A
8. Enzyme found in retrovirus that produces DNA from an RNA template E
9. Enzyme used to position nucleotides during DNA replication B
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From gene to protein
transcription
translation
protein
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mRNA
Protein syntheis
DNAtranscription
nucleus cytoplasm
translation
trait
aa
aa
aa
aa
aa
aa
aa
aaaa
aa
protein
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Matching bases of DNA & RNA• Double stranded DNA unzips
A G GGGGGT T A C A C T T T T TC C C CA A
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Matching bases of DNA & RNA• Match RNA bases to DNA bases on
one of the DNA strands
U
A G GGGGGT T A C A C T T T T TC C C CA A
U
UU
U
U
G
G
A
A
A C C RNA polymerase
C
C
C
C
C
G
GG
G
A
A
A
AA
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Matching bases of DNA & RNA• U instead of T is matched to A
TACGCACATTTACGTACGCGGDNA
AUGCGUGUAAAUGCAUGCGCCmRNAaa
aa
aa
aa
aa
aa
aa
aaaa
aa
U C CCCCCA A U G U G A A A A AG G G GU Uribosome
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RNA Processing
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AUGCGUGUAAAUGCAUGCGCCmRNA
mRNA codes for proteins in tripletsTACGCACATTTACGTACGCGGDNA
AUGCGUGUAAAUGCAUGCGCCmRNA
Met Arg Val Asn Ala Cys Alaprotein
?
Codon = block of 3 mRNA bases
codonribosome
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• For ALL life!• strongest support for a
common origin for all life
• Code has duplicates• several codons for each
amino acid• mutation insurance!
Start codon AUG methionine
Stop codons UGA, UAA, UAG
The mRNA code
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How are the codons matched to amino acids?
TACGCACATTTACGTACGCGGDNA
AUGCGUGUAAAUGCAUGCGCCmRNA
anti-codon
codon
tRNAUAC
MetGCA
ArgCAU
Val Anti-codon = block of 3 tRNA bases
aminoacid
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mRNA to protein = Translation• The working instructions mRNA• The reader ribosome• The transporter transfer RNA (tRNA)
mRNAU C CCCCCA A U G U G A A A A AG G G GU U
aaaa
aa
tRNA
GGU
aatRNA
U A C
aatRNA
GA C
tRNA
aa
A GU
ribosome
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Building Proteins• Organelles involved
• nucleus• ribosomes• endoplasmic reticulum
(ER)• Golgi apparatus• vesicles
nucleus ribosome ER Golgiapparatus vesicles
The Protein Assembly Line
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Question 10: Which of the following is true of mitosis?(A) It is also known as cytokinesis (B) It maintains the same chromosome number in the daughter cells as
in the parent cell.(C) It is the last phase of interphase.(D) It regulates the transfer of genetic information from one daughter
cell to another.(E) It moves homologous chromosomes to opposite poles
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Question 11: Which of the following is true of mitosis?(A) It is also known as cytokinesis (B) It maintains the same chromosome number in the daughter cells as
in the parent cell.(C) It is the last phase of interphase.(D) It regulates the transfer of genetic information from one daughter
cell to another.(E) It moves homologous chromosomes to opposite poles
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QUESTION 12: A biologist counted 2,500 cells from an embryo on a microscope slide and recorded the following data.
Stage Number of CellsProphase 125Metaphase 50Anaphase 50Telophase 25Interphase 2,250 Total 2,500If these cells had been dividing randomly, it could be reasonably concluded that(A) The duration of anaphase is approximately one-half that of telophase(B) prophase is approximately 3 times as long as telophase(C) Metaphase is the shortest stage of the cell cycle(D) Interphase is the longest stage of the cell cycle(E) the chromosome can first be seen in prophase
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QUESTION 12: A biologist counted 2,500 cells from an embryo on a microscope slide and recorded the following data.
Stage Number of CellsProphase 125Metaphase 50Anaphase 50Telophase 25Interphase 2,250 Total 2,500If these cells had been dividing randomly, it could be reasonably concluded that(A) The duration of anaphase is approximately one-half that of telophase(B) prophase is approximately 3 times as long as telophase(C) Metaphase is the shortest stage of the cell cycle(D) Interphase is the longest stage of the cell cycle(E) the chromosome can first be seen in prophase